Observations of cold antihydrogen

被引：7

作者：

Tan, JN

Bowden, NS

Gabrielse, G

Oxley, P

Speck, A

Storry, CH

Wessels, M

Grzonka, D

Oelert, W

Schepers, G

Sefzick, T

Walz, J

Pittner, H

Hänsch, TW

Hessels, EA

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Forschungszentrum Julich, IKP, D-52425 Julich, Germany

[3] CERN, CH-1211 Geneva 23, Switzerland

[4] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[5] Univ Munich, D-80799 Munich, Germany

[6] York Univ, Dept Phys & Astron, N York, ON M3J 1P3, Canada

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2004年 / 214卷

关键词：

antihydrogen; nested Penning trap; positron cooling; recombination in cold plasma; Rydberg atom; field ionization;

D O I：

10.1016/S0168-583X(03)01777-4

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

ATRAP's e(+) cooling of (p) over bar in a nested Penning trap has led to reports of cold H produced during such cooling by the ATHENA and ATRAP collaborations. To observe (H) over bar, ATHENA uses coincident annihilation detection and ATRAP uses field ionization followed by (p) over bar storage. Advantages of ATRAP's field ionization method include the complete absence of any background events, and the first way to measure which (H) over bar states are produced. ATRAP enhances the (H) over bar production rate by driving many cycles of e(+) cooling in the nested trap, with more (H) over bar counted in an hour than the sum of all the other antimatter atoms ever reported. The number of (H) over bar counted per incident high energy (p) over bar is also higher than ever observed. The first measured distribution of (H) over bar states is made using a pre-ionizing electric field between separated production and detection regions. The high rate and the high Rydberg states suggest that the (H) over bar is formed via three-body recombination, as expected. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：22 / 30

页数：9

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